Pass pepper apps API calls through the existing js apps API bindings.

chrome/renderer/resources/extensions/pepper_request.js

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var SendResponse = requireNative('pepper_request_natives').SendResponse;
+var GetAvailability = requireNative('v8_context').GetAvailability;
+
+function checkAvailability(name) {
+  var availability = GetAvailability(name);
+  if (!availability.is_available)
+    throw Error(availability.message);
+}
+
+function resolveName(name) {
+  checkAvailability(name);
+  var item = chrome;
+  var nameComponents = $String.split(name, '.');
+  for (var i = 0; i < nameComponents.length; i++) {
+    item = item[nameComponents[i]];
+  }
+  return item;
+}
+
+function callMethod(targetName, requestId) {
+  var args = $Array.slice(arguments, 2);
+  args.push(function() {
+    var error = null;
+    if (chrome.runtime.lastError)
+      error = chrome.runtime.lastError.message;
+    SendResponse(requestId, $Array.slice(arguments), error);
+  });
+  try {
+    var target = resolveName(targetName);
+    $Function.apply(target, null, args);
+  } catch (e) {
+    return e.message;
+  }
+}
+
+function postMethod(targetName) {
+  var args = $Array.slice(arguments, 1);
+  try {
+    var target = resolveName(targetName);
+    $Function.apply(target, null, args);
+  } catch (e) {
+    return e.message;
+  }
+}
+
+exports.callMethod = callMethod;
+exports.postMethod = postMethod;